Trane 4TXM2318BF300AA Service Manual page 134

[6] Voltage too High or Low
Check if voltage of power
supply is normal
Check if wiring of
electric box is correct
In operation, check power
module voltage between
terminal P&N more than
390V or less than 160V
Check rectifier, rector,
electrolytic capacitor in
inverter main circuit
N
Y
N
Y
N
Y
132
Improve power supply circuit
Correct the wiring due to diagram
Replace power module